Some of the more sophisticated egalitarians will admit, when put on the spot, that the human races, when tested, do demonstrate significant variations in intellect and temperament, but quickly attribute those differences to environment. It's popular, for example, to blame the average Black African 70 I. Q. to poor nutrition. And that might even be a small part of the reason, because Black Africans who live outside have average I. Q's as high as 85. And of course there's the one-size-fits-all "racism" explanation, which explains everything, just like shouts of "heresy!" win arguments in religious matters. I told you human equality was a matter of faith, not of fact.
Well, all right, let's suppose, despite everything, that environment does have a huge effect on intellect and temperament. Let's get to people before the environment has had a chance to have an effect. Let's test newborn babies to see how they compare. Well, that's already been done. From Greg Cochran's blog: